9 research outputs found
Probabilistic Model-Based Safety Analysis
Model-based safety analysis approaches aim at finding critical failure
combinations by analysis of models of the whole system (i.e. software,
hardware, failure modes and environment). The advantage of these methods
compared to traditional approaches is that the analysis of the whole system
gives more precise results. Only few model-based approaches have been applied
to answer quantitative questions in safety analysis, often limited to analysis
of specific failure propagation models, limited types of failure modes or
without system dynamics and behavior, as direct quantitative analysis is uses
large amounts of computing resources. New achievements in the domain of
(probabilistic) model-checking now allow for overcoming this problem.
This paper shows how functional models based on synchronous parallel
semantics, which can be used for system design, implementation and qualitative
safety analysis, can be directly re-used for (model-based) quantitative safety
analysis. Accurate modeling of different types of probabilistic failure
occurrence is shown as well as accurate interpretation of the results of the
analysis. This allows for reliable and expressive assessment of the safety of a
system in early design stages
EMSO ERIC: A challenging infrastructure to monitor Essential Ocean Variables (EOVs) across European Seas
The European Multidisciplinary Seafoor and water Column Observatory (EMSO, www.emso.eu) is a distributed research infrastructure (RI), composed of fxed-point deep-sea observatories and shallow water test sites at strategic environmental locations from the southern entrance of the Arctic Ocean all the way through the North Atlantic through the Mediterranean to the Black Sea. Working as a single powerful system, it is a valuable new tool for researchers and engineers looking for long time series of high-quality and high-resolution data to study and continuously monitor complex processes interactions among the geosphere, biosphere, hydrosphere and atmosphere, as well as to test, validate and demonstrate new marine technologies.Peer Reviewe
EMSO ERIC: A challenging infrastructure to monitor Essential Ocean Variables (EOVs) across European Seas
Special issue 9th MARTECH: International Workshop on Marine Technology: 16-18 June 2021, Vigo, Spain.-- 2 pages, 1 figureThe European Multidisciplinary Seafoor and water Column Observatory (EMSO, www.emso.eu) is a distributed research infrastructure (RI), composed of fxed-point deep-sea observatories and shallow water test sites at strategic environmental locations from the southern entrance of the Arctic Ocean all the way through the North Atlantic through the Mediterranean to the Black Sea. Working as a single powerful system, it is a valuable new tool for researchers and engineers looking for long time series of high-quality and high-resolution data to study and continuously monitor complex processes interactions among the geosphere, biosphere, hydrosphere and atmosphere, as well as to test, validate and demonstrate new marine technologiesPeer reviewe
La ricerca delle sabbie sulla piattaforma continentale ligure: campagna di Geologia marina per la localizzazione dei depositi sedimentari idonei al ripascimento dei litorali.
Tracking deformation processes at the Legnica Glogow Copper District (Poland) by Satellite InSAR. 2.: Żelazny most tailings dam
The failures of tailings dams have a major negative impact on the economy, surrounding
properties, and people’s lives, and therefore the monitoring of these facilities is crucial to mitigate
the risk of failure, but this can be challenging due to their size and inaccessibility. In this work,
the deformation processes at Zelazny Most tailings dam (Poland) were analyzed using satellite Ad- Ë™
vanced Differential SAR Interferometry (A-DInSAR) from October 2014 to April 2019, showing that
the dam is affected by both settlements (with a maximum rate of 30 mm/yr), and horizontal sliding
in radial direction with respect to the ponds. The load of the tailings is pushing the dam forward
along the glacio-tectonic shear planes located at depth, in the Pliocene clays, causing horizontal
displacements at a rate up to 30 mm/yr, which could lead to a passive failure of the dam. The
measured displacements have been compared with the ones observed by in situ data from the 90s to
2013, available in the literature. The outcomes indicate that intense localized deformations occur in
the eastern and northern sectors of the dam, while the western sector is deforming evenly. Moreover,
although the horizontal deformation had a slowdown from 2010 until 2013, it continued in 2014
to 2019 with recovered intensity. The upper and the recent embankments are affected by major
settlements, possibly due to a lower consolidation degree of the most recent tailings and a larger
thickness of compressible materials
Tracking deformation processes at the Legnica Glogow Copper District (Poland) by Satellite InSAR—I. Room and Pillar Mine District
Mining exploitation leads to slow or rapid ground subsidence resulting from deformation
until the collapse of underground post-mining voids following excavation activities. Satellite SAR
interferometry capabilities for the evaluation of ground movements allows the monitoring of intensive
surface mine subsidence and can provide new knowledge about the risks in the mining industry. This
work integrates both conventional and advanced Differential SAR Interferometry (DInSAR) to study
the ground subsidence in the Legnica Glogow Copper District (LGCD, Poland) by processing about
400 Sentinel-1 images from October 2014 to April 2019. Even without field data and information
on past and ongoing excavation activities, the DInSAR approach allowed us to identify 30 troughs
of subsidence, ranging from 500 m to 2.5 km in diameter, which in some cases, took place several
times during the analyzed time span. The cumulative subsidence in 4 years and 7 months exceeds
70 cm in several zones of the LGCD. The sub-centimetric precision achieved by advanced analysis
(A-DInSAR), allowed us to monitor the real extent of the mining influence area on the surface, with
deformation velocities of up to 50 mm/year. The ground deformation detected at LGCD can be due
to both mining-induced tremors and roof subsidence above the underground excavation rooms. As
deformations do not occur concurrently with tremors, this can be related to excavation activities or to
degradation of abandoned mines
L\u2019evoluzione del campo dunare di Platamona-Marritza (Nord Sardegna): aspetti morfo-sedimentologici e vegetazionali.
Discovery of Versilian deposits suitable for beach nourishment on the continental shelf of Western Liguria.
In this paper we present the results of a study conducted in collaboration with the Ligurian Region, in the framework of the E.U. Beachmed-e Interreg IIIc Project, to distinguish relic coastal deposits on the continental shelf, suitable for beach nourishment. These deposits are related to transgressive-regressive sedimentary cycles, and they are due to Quaternary glacio-eustatic sea level variations. In fact, during the sea level low stand associated with the last glacial maximum (c.18\u201320,000 yBP) the sea level was 110\u2013120 m lower than its present level and the continental shelf was exposed. During the Versilian Transgression the coastline migrated from the shelf break to its present position. This migration was not continuous and conspicuous sediment bodies, associated with deltaic or littoral systems, were deposited during static periods. The results of a marine geology campaign with seismostratigraphic and sedimentological analyses enabled us to distinguish gravelly and sandy littoral deposits at depths of 20\u201340 m near the coast and 60\u201380 m on the outer shelf, in areas with only a thin Holocene mud cover (high stand deposits)
Geological risks in large cities: The landslides triggered in the city of Rome (Italy) by the rainfall of 31 January-2 February 2014
An exceptional rainfall battered the city of Rome (Italy) from 31 January to 2 February 2014. The event had variable intensity and duration in the different parts of the city. The exceptionality of the event lies in the intensity of rainfall cumulated in 6 hours (return period > 50 years) and in its uneven distribution over the urban area. The event triggered a number of landslides of different type, which caused substantial damage. Researchers from the Centro di Ricerca per i Rischi Geologici (Research Centre on Prediction, Prevention and Control of Geological Risks - CERI) of the University of Rome "Sapienza" carried out field surveys and assessments immediately after the event. The team detected and inventoried 68 landslides, mostly occurring in the sandy and sandy-silty deposits of the Monte Mario, Ponte Galeria and Valle Giulia Formations. The complete inventory of the landslides is accessible via WebGIS on CERI's website http://www.ceri.uniroma1.it/cn/landslidesroma.jsp. The spatial distribution of the landslides evidences that 69% occurred in clastic deposits of sedimentary origin and only 6% in volcanic deposits. This finding disagrees with more general statistical data, based on the inventory of Rome's historical landslides, indicating that almost 41% of slope instabilities occur in volcanic deposits and almost 12% in sedimentary ones. In the data reported here, this apparent contradiction is justified by the fact that most the rainfall under review was concentrated in the north-western portion of Rome's urban area, whose hills accommodate outcrops of dominantly sedimentary deposits from Plio-Pleistocene marine and continental cycles. © Sapienza Università Editrice